Primal isn't necessarily about eating exactly what "Grok" ate. It is about eating in a way that agrees with out genetics and evolution. We can eat a modern diet that stays true to our design to burn fat for fuel. I think this blog post from Mark might be helpful for you: When Science Trumps Grok | Mark's Daily Apple
Also, please note that what you can find some whackadoodle stuff on the forums, so you don't want to be getting your definitions here.